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Sep 19th, 2017
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  1. $ sudo tcpdump -n -i enp0s25 -c 5 host 239.255.42.42; sudo iptables -S; ffmpeg -i 'udp://239.255.42.42:5004?timeout=10000000'; sudo tcpdump -n -i enp0s25 -c 5 host 239.255.42.42
  2. tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  3. listening on enp0s25, link-type EN10MB (Ethernet), capture size 262144 bytes
  4. 13:13:41.807541 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  5. 13:13:41.807804 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  6. 13:13:41.808322 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  7. 13:13:41.808662 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  8. 13:13:41.808920 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  9. 5 packets captured
  10. 7 packets received by filter
  11. 0 packets dropped by kernel
  12. -P INPUT ACCEPT
  13. -P FORWARD ACCEPT
  14. -P OUTPUT ACCEPT
  15. ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  16. built with gcc 7.2.0 (GCC)
  17. configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-shared --enable-version3
  18. libavutil 55. 58.100 / 55. 58.100
  19. libavcodec 57. 89.100 / 57. 89.100
  20. libavformat 57. 71.100 / 57. 71.100
  21. libavdevice 57. 6.100 / 57. 6.100
  22. libavfilter 6. 82.100 / 6. 82.100
  23. libavresample 3. 5. 0 / 3. 5. 0
  24. libswscale 4. 6.100 / 4. 6.100
  25. libswresample 2. 7.100 / 2. 7.100
  26. libpostproc 54. 5.100 / 54. 5.100
  27. udp://239.255.42.42:5004?timeout=10000000: Input/output error
  28. tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  29. listening on enp0s25, link-type EN10MB (Ethernet), capture size 262144 bytes
  30. 13:13:52.601117 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
  31. 13:13:52.602149 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
  32. 13:13:52.603126 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
  33. 13:13:52.604257 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
  34. 13:13:52.604515 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 1316
  35. 5 packets captured
  36. 6 packets received by filter
  37. 0 packets dropped by kernel
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